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A car traveled 462 miles per tankful of gasoline on the [#permalink]
12 Jul 2007, 09:01

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20. A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?

20. A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city?

(A) 14 (B) 16 (C) 21 (D) 22 (E) 27

B for me.

If x is the total capacity of the tank, then
462/x - 336/x = 6
x = 21 gallons.

Thanks guys..
I too got it... Without looking at your solutions.. I found that I can solve most of maths problems when focused and calm. and that is what is very difficult to be when the clock is ticking..

Here is how I solved :

Let the miles/gallon in city = y
Let the miles/gallon on highway = y+6
Gallons of gasoline when fulltank = x